Apparatus for constructing sectional molds



G. DELAGE. APPARATUS FOR CONSTRUCTING SECTIONAL MOLDS..

APPLICATION FILED JUNE II. I9I8.

Patented Dec. 14, 19 29.

3 SHEETS-MEET 1.

G. DELAGE. APPARATUS FOR CONSTRUCHNG'SECTIONAL MOLDS.

APPLICATION FILED JUNE H, 1918.

- Patented Dec. 14,1920.

3 SHEETS-SHEET 2.

of sections with their sta-ves,

UNITED s'rArss 35.11am OFFICE.

GUSTAVE DELAGE, OF ISSY-LES-MOULINEAUX, FRANCE, ASSIGNOR TO SOCIE-TE ANONYME DES ETABLISSEMENTS NEIUPOBT, OF ISSY-LES-MOULINEAUX,

FRANCE.

Specification of Letters Patent.

Patented Dec. 14, 1920.

Application filed June 11, 1918. Serial No. 239,433.

To all whom it mag concern.

Be it known that I, GUs'rAvn DELAGE, a citizen of the French Republic, and resident of Issyles-Moulineaux, France, have invented certain new and useful Improvements in Apparatus for Constructing Sectional Molds, of which the following is' a specification.

This invention has for its object to provide an improved process for the construction of sectional molds, the characteristic feature of which is that the mold is composed of a plurality of sections held in place by internal mandrels which it is sufficient to merely dismount after the molding operation, in order to remove the sections of the mold without any difliculty.

The improved process is more particularly designed for the manufacture of the hulls or fuselages for aeroplanes in one piece which are constructed for instance of sheets or plates of metal or sheets or plates of plied wood, but this process is also applicable to the construction of all kinds of hulls or hollow bodies of curved profile where it is not possible to remove in one piece the mold that has served for making them.

A practical construction of a mold made according to the improved process, suitable for the manufacture of an aeroplane hull, is illustrated by way of example in the accompanying drawings in which:

Figure 1 is a perspective detail of the mold with the outer section detached therefrom.

Fig. 1." is a perspective detail of the man drel of the outer section of the mold and the spider.

Fig. 2 is a perspective view of two pairs detached from the mold.

Fig. 3 is a view of aportion of a mold showing the same partly in longitudinal section and partly in side elevation.

Fig. 3 is a freg'mentary view. of the remaining portion of the mold.

Fig. 4 is a half section on the line D-E of Fig. 3 as to its upper half, and a half section on the line F-Gr of the same Fig. 3 as to its lower half.

Fig. 5 illustrates union-piece for the lower wing or the core for molding the plane.

Fig. 6 is a perspective view of one of the upright cores.

1n the practical construction shown, the mold for the hull of an aeroplane is composed of a series of mandrels a (Fig. 1)

mounted on a central shaft 1), four rods 0 extending through arms the last mold section 8 which is previously provided with screw threaded sleeves (2 These rods 0 carry abutment rings 7, f f 7' fixed in an adjustable manner at determined distances of the sections. Each mandrel is composed of two polygonal rings 9 and h which are connected by a series of longitudinal bars 2' or dovetail slides, upon which are assembled at the time of mounting the mold, segments 7' that constitute a sort of circular rim around each ring 9 or h.

The slides 2' project beyond the ring it of each section for distances that increase progressively from the first section to the last section.

The segments are united in pairs (Fig. 2) by means of staves 76 having rabbets that form on the mold, lodgments for receiving the longitudinals Z that serve as an internal reinforcement for the hull to which they are attached by screwing or nailing at the time of manufacture of the latter.

These longitudinals are stayed together by means of hoops m which are previously inserted between the mold sections and are centered by means of tongues n of which there is one to each segment j.

At the time of mounting the mold, the mandfels which have been previously provided with their pairs of segments and their staves, are slipped successively on to the central shaft Z), while affording a passage to the rods 0 upon which the abutment rings 7 are mounted after each section has been placed in position. The hoops m are then placed in position and the mold is tightened up by means of the spider 0 which bears on the one hand against the segments j of the first section, and receives on the other hand a pressure by means of nuts 19 screwed upon the ends of the rods 0.

In the application of the improved apparatus for molding the hull of an aeroplane, the improved process allows of molding the projecting parts, subh as the uprights of the upper wing or plane, the unions 6, being screwed in v as those shown in of it it will for the lower wings and auxiliary surfaces, with the actual hull, in such a manner that these parts will form an integral portion thereof instead of being separate parts affixed to it as has hitherto been the usual method.

This method of construction allows of producing a machine having the greatest possible lightness and strength. WVith this object, some of the staves have been removed and replaced by aflixed blocks, such constitute the cores 1- for the uprights of the upper planes and the cores 8 for the unions for the lower planes.

- In this particular case the parts 9 of the uprights become longitudinals which are not divided and which form one piece with the hull after removal from the mold.

Theseafiixed cores are held in position on the mold by means of screws whereby they are fixed on the segments 7' with which they come in contact. hese screws are then .removed gradually as they are reached, in the construction of the hull, so as to allow of removing the cores without removing the pattern from the mold.

his improved sectional mold which can be removed from the inside allows for instance of making an aeroplane hull by means of walls composed of wooden planks plied which serve as their internal reinforcement.

he removal of the pattern from the mold is efi'ected by unscrewing the rods 0. Durstop ring f situated behind section No. 1, comes in contact with the arms e of the r'ng 'k of the first mandrel which thus slides between the slides 2', becoming detached from each of the segments 7' that surround it as shown in Fig. When th has been completely detached and removed, there is removed 1 one of the at right angles'to the longitudinal axis of the central tube 6. The other segments will then fall down of themselves or can be detached and-removed without any difficulty. unscrew the rods 0, the into contact with the and pushing thelatter in front detach it by releasing stop f is brought mandrel a,-

respond thus be removed in the same way as the preceding section 1, and so on.

e successive removal of the mandrels from the mol is caused by the simple fact that the stops f are situated at increasing mg the covering.

distances from the rings it of the various mandrels, so that each stop comes into contact with the corresponding mandrel only when the preceding section has been removed.

The mold core 1 corresponding to the uprights of the upper planes, drops and can be readily removed after the dismounting and removal of the sections 1 and 2. The mold core 8 corresponding to the unions of the lower planes is likewise removed from the inside after the removal of the sections 1, 2 and 3.

The last section 8 carries the cores of the auxiliary surfaces t, of the vertical rudder u and of the bracket 11 which are removed from the mold in the opposite direction to the section 8 by the usual means. The above described arrangements are given solely by way of example. The shapes, dimensions, constructional details and applications may vary without departing from the essential nature of the invention.

aving now particularly described and ascertained the nature of my said invention and in what manner the same is to be performed, I declare that what I claim is 1. n apparatus of scribed including a plurality of sections, a shaft arranged through the sections, rods extending through the sections and retaining means embracing the outer surfaces of the sections.

2.- An interior molding apparatus of the character described including a plurality of sections, a shaft arranged through the sections, rods also extending longitudinally through the sections having their inner ends threaded and anchored in the innermost section, abutments carried by the rods at uniformly spaced intervals, clamping means engaging the outer ends of the rods for olding sectionsin proper relationship and coactive retaining means embracing the outer surfaces of the sections.

An interior moldin apparatus comprising a plurality of sections each of which consists of a mandre tions are mounted, rods arranged through the arms of the mandrels and havin their inner-portions screw threaded, screw t readed sleeves in the innermost end section for receiving the correspondingly threaded ends of the rods, abutment rings on the rods for adjustably engageablewith the outer ends of the rods, a sectional covering surrounding the sections and retaining means embrac- 4. An interior mold of the character described comprising,'a plurality of sections each of which, exce t one, consists of a mandrel composed o a pair of rings prothe character de-' vided with radial arms, dovetail longitudied sleeves in the innermost end section for nal bars connecting the rings, a sectional receiving the correspondingly threaded en s i rim surrounding each mandrel and comof the rods, abutment rings on the rods for 25 posed of a plurality of segments designed to coacting withthe mandrel, retaining longi- 5 be interlocked, with the dovetail bars, screw tudinals arranged against the sectional covthreaded rods mounted in' the mold sections, ering and hoops coacting with the longia shaft for supporting the sections, a plutudinals and maintaining he rod sections in rality of rods arranged longitudinally proper relationship. 30 through the several mold sections and hav- 6. An interior molding apparatus includ- 10 ing their inner ends screw threaded and ing a plurality of sections, means for reengaged in the sleeves, a spider for embracleasably clamping-the sections in longituing the outer ends of the shaft and the rods, dinal relationship, a sectional covering arand clamping means engaged on the outer ranged about the mold sections and pro- 35 ends of the rods. vided at points with recesses, cores fitted in 15 5. An interior molding apparatus comthe recesses and retaining means embracing prising a plurality of sections each of which the covering and the cores. 1

consists of a mandrel composed of spaced Dated this QOth'day of March, 1918.

rings connected to ether and provided with 1 radiating arms, a shaft on which the sec- (IUSTAVE DELAGE' 20 tions are mounted, rods arranged through Witnesses:

the arms of the mandrel and having their CHAS. P. PRnssLY,

.inner portions screw threaded, screw thread- Vio'roR DUPONT. 

